<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
  <el-header>
    <div>
      <img src="../assets/logo2.png" alt="">
      <span>电商后台管理系统</span>
    </div>
    <el-button type="info" @click="logout">退出</el-button>
  </el-header>
  <!-- 页面主体区域 -->
  <el-container>
    <!-- 侧边栏 -->
    <el-aside :width="isCollapse ? '64px': '200px'">
      <div class="toggle-button" @click="toggleCollapse">|||</div>
      <!-- 侧边栏菜单区域 -->
      <el-menu
      background-color="#333744"
      text-color="#fff"
      active-text-color="#409EFF"
      unique-opened
      :collapse="isCollapse"
      :collapse-transition="false"
      router
      :default-active="actviePath"
      >
        <!-- 一级菜单 -->
        <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
          <!-- 一级菜单的模板区 -->
          <template slot="title">
            <!-- 图标 -->
            <i :class="iconsObj[item.id]"></i>
            <!-- 文本 -->
            <span>{{item.name}}</span>
          </template>
          <!-- 二级菜单 -->
          <el-menu-item :index="'/' + subItem.paths + ''" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/' + subItem.paths)">
            <template slot="title">
              <!-- 图标 -->
              <i class="el-icon-menu"></i>
              <!-- 文本 -->
              <span>{{subItem.name}}</span>
            </template>
          </el-menu-item>
        </el-submenu>
      </el-menu>
    </el-aside>
    <!-- 右侧内容主体 -->
    <el-main>
      <!-- 路由占位符号 -->
      <router-view></router-view>
    </el-main>
  </el-container>
  </el-container>
</template>

<script>
export default {
  name: 'Home',
  data () {
    return {
      menuList: [],
      iconsObj: {
        1: 'iconfont icon-user',
        2: 'iconfont icon-tijikongjian',
        6: 'iconfont icon-shangpin',
        7: 'iconfont icon-danju',
        8: 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      actviePath: ''
    }
  },
  created () {
    this.getMenuList()
    this.actviePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList () {
      const { data: res } = await this.$http.post('menus')
      if (res.code !== 200) this.$message.error(res.msg)
      this.menuList = res.data
    },
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState (actviePath) {
      window.sessionStorage.setItem('activePath', actviePath)
      this.actviePath = window.sessionStorage.getItem('activePath')
    }
  }
}
</script>

<style lang="less" scoped>
  .home-container{
    height: 100%;
  }
  .el-header{
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div{
      display: flex;
      align-items: center;
      span{
        margin-left: 15px;
      }
    }
  }
  .el-aside{
    background-color: #333744;
    .el-menu{
      border-right: none;
    }
  }
  .el-main{
    background-color: #EAEDF1;
  }
  .iconfont{
    margin-right: 10px;
  }
  .toggle-button{
    background-color: #4a5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
</style>
